*Small pocket knife shape & compact design *Measures air velocity ,temperature, windchill temperature and humidity. *6 wind units selectable: KNT(knot), BF(beaufort), FPM (feet per minute), MPH(mile per hour), MS(meter per second), *KMH(kilometer per hour) o o *Temp. Units C/ F selectable *Display max. windspeed and quick response *Display 5, 10, 13 seconds average windspeed *Water resistant & shock proof. 8908:IP65, 8918:IP54 *Easy to operate by only two buttons *Hold function to freeze current readings *Auto power off in 15 or 20 mins inactivity to save power *Tripod mountable receptacle *Wind speed accuracy:+/- (3% of reading +0.2 m/s) *Air temp. range:-15~50.0 C *Air temp. resolution:0.1 C/ F *Air temp. accuracy:+/-1 C *Air RH% range:5%RH~95%RH *Air RH% resolution:0.1%RH *Air RH% accuracy:+/-3%RH(at 25 C, 10 ~90%RH, others +/-5%RH) *Wind speed response time:averaging every 2 seconds *Temp. response time:60 seconds (typical) *Air RH% response time:60 seconds (typical) *LCD size:16(H)x28(W)mm *Operating temp.:-15~50 C *Operating RH%:Humidity <80% *Storage temp.:-20~50 C *Storage RH%:Humidity <90% *Dimension(mm):140x45x25 (90 folded);235x45x25 (180 full opened) *Weight:~90g